Opening a new folder closes exists terminal with process in it

[KEMBL]

• VSCode Version: Code 1.17.2 (b813d12, 2017-10-16T13:59:46.104Z)
• OS Version: Windows_NT x64 10.0.14393
• Extensions:

Extension	Author (truncated)	Version
angular-material	1to	0.13.0
ng-template	Ang	0.1.7
path-intellisense	chr	1.4.2
EditorConfig	Edi	0.11.1
tslint	eg2	1.0.14
prettier-vscode	esb	0.24.0
auto-rename-tag	for	0.0.15
angular-essentials	joh	0.3.2
Angular2	joh	2.10.0
Angular-BeastCode	Mik	5.0.12
debugger-for-chrome	msj	3.5.0
angular2-inline	nat	0.0.17

(1 theme extensions excluded)

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Steps to Reproduce:

1. Open VS code
2. Open terminal
3. Start some install process, like npm install -g @angular/cli
4. while it in progress in Vs code open new folder

Result: the whole vs code window is reinitialized with terminal where installation was.

Reproduces without extensions: Does not matter.

[Tyriar]

Duplicate #20013